LM48312 - 2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power Amplifier with E2S

The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48312 features TI’s Enhanced Emissions Suppression (E²S) system, that features a unique patented ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E²S system improves battery life, reduces external component count, board area consumption, and system cost, simplifying design.

The LM48312 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48312 features both a spread spectrum modulation scheme, and an advanced, patented edge rate control (ERC) architecture that significantly reduces emissions, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%).

The LM48312 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving an 8Ω speaker from a 5V supply, the device operates with 88% efficiency at P_O = 1W. The LM48312 features five gain settings, selected through a single logic input, further reducing solution size. A low power shutdown mode reduces supply current consumption to 0.01µA.

Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

Products containing the "LM48312" keyword are: LM48312TLE , LM48312TLE/NOPB , LM48312TLE/NOPB , LM48312TLX , LM48312TLX/NOPB , LM48312TLX/NOPB

• Passes FCC Class B Radiated Emissions with 20 Inches of Cable
• E²S System Reduces EMI While Preserving Audio Quality and Efficiency
• Output Short Circuit Protection with Auto-Recovery
• No Output Filter Required
• Improved Audio Quality
• Minimum External Components
• Five Logic Selectable Gain Settings (0, 3, 6, 9, 12dB)
• Low Power Shutdown Mode
• Click and Pop Suppression
• Available in Space-Saving DSBGA Package

Key Specifications

• Efficiency at 3.6V, 400mW into 8Ω, 84% (Typ)
• Efficiency at 5V, 1W into 8Ω, 88% (Typ)
• Quiescent Power Supply Current at 5V, 3.1mA
• Power Output at V_DD = 5V, R_L = 4Ω
  • THD+N ≤ 10%, 2.6W (Typ)
  • THD+N ≤ 1%, 2.1W (Typ)
• Power Output at V_DD = 5V, R_L = 8Ω
  • THD+N ≤ 10%, 1.6W (Typ)
  • THD+N ≤ 1%, 1.3W (Typ)
• Shutdown Current, 0.01μA (Typ)

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